Contact us
Choose a category below so we can get back to you as quickly as possible.
兩個圓:以對稱軸為圓心連線的中垂線,圓心連線過中心點 兩個三角形:不可能 兩條平行線:與對稱軸平行,對稱軸在正中
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.